Create extra package from docs/datacard.py

[hagenw]

As we also have a internal project that lists databases,
and it would make it much easier for others to also create data cards,
I would argue that we should create an extra package for creating a data card.
The package should contain all the code from docs/datacard.py that is responsible for creating a single data card,
which means leave out the code that lists available databases.

Unfortunately, the name datacards for a corresponding Python package is already taken,
maybe we go with audbcards?

@ChristianGeng any other suggestions?

[ChristianGeng]

Concerning the name: audbcards is more specific and therefore better - as the code will only be useful in the context of data handled within audb. I am happy with this.

[hagenw]

as the code will only be useful in the context of data handled within audb

Exactly, this was also my motivation behind the name.